Add defines for "ATLEAST_CXX11"
Add defines for "ATLEAST_CXX11"

m13253/backward-cpp,bombela/backward-cpp,Manu343726/backward-cpp,bombela/backward-cpp,Ghostist/backward-cpp,Manu343726/backward-cpp,bombela/backward-cpp,Manu343726/backward-cpp,m13253/backward-cpp,Ghostist/backward-cpp